UNDERGROUND SOLUTIONS

USAmp Prime
Insulated Cable Ampacity Software

Engineering
Product Overview

USAmp Prime models all types of underground power cables (pipe-type, extruded, and solid paper).

  • Computes steady-state and transient ampacities and temperatures for multiple cables with equal or unequal loading.
  • Models duct banks, pipe cables, extruded cables, directly buried cables, casings, or mixtures thereof.
  • Models steam lines or other extraneous heat sources.
  • Models aerial cable installations with enhanced pictorial interface.
  • Computes short-circuit rating of conductors, shields, and armor.
Installation with a duct bank and a casing
Installation with a duct bank and a casing

Operation

The user selects an empty installation (a cable-free “container”), such as a duct bank, backfill, or casing, and places it at a specified location below the earth’s surface. The user may place multiple such containers. Cables are inserted into the container ducts by double clicking the mouse over an empty duct and choosing a cable from a pre-defined cable library or by creating a new cable. The user can then make a choice of adding the cable as a single-phase, three-phase, or multiple-cable-per-phase circuit. The inserted circuit can also be configured by specifying the type of transposition and sheath bonding (single-end, multiple-end, or cross-bonded). The cable locations are changed through simple drag-and-drop.

An external heat source (such as a steam line) can be placed in the installation and the steam temperature or the heat loss is specified.

The earth thermal resistivity and ambient temperature are entered into the program with the option of iterating between multiple values.

Computation specification form
Computation specification form

 

The ampacities of the installation cables can be computed simultaneously for steady-state or transient conditions. For steady-state conditions, the load temperature or current is specified. For transients, inputs include the time period, pre-load temperature or current, and load temperature or current. Multiple steady-state computations and transient computations are allowed.

Report showing input and output
Report showing input and output

Features
  • Completely redesigned graphical user interface;
  • “What you see is what you get”: all installation and cable graphics are to scale (including the multiple layers in a cable);
  • Export report showing outputs and inputs into Adobe PDF, Microsoft® EXCEL©, or Microsoft® Word©;
  • AEIC cable specifications are built into the program;
  • Many cables may be rated simultaneously;
  • Short-circuit ratings of conductors, shields, and armor;
  • In-air cable ratings;
  • Switch between metric and English units.
Cable design form (to scale)
Cable design form (to scale)

 

Input of cable designs is facilitated by a cable “expert system”.  The AEIC cable specifications are “built-in” to the program.  The user inputs basic parameters (cable type, insulation type, voltage rating and conductor area).  Then the program retrieves the standard dimensional features and calculation constants for the cable and displays them.  They may be edited “on-screen” to accommodate “non-standard” features

Short-circuit analysis form
Short-circuit analysis form

Methodology

The program is compliant with the IEC 60287 standard for the steady-state ratings and IEC 60853 for the transient ratings. Furthermore, IEC 60949 is used for short-circuit ratings.

Cable print form (to scale)
Cable print form (to scale)

 

Aerial ratings form
Aerial ratings form

FOR MORE INFORMATION

A free demo package of USAmp Prime is available upon request. Contact USi for more information and pricing.


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